Small brushed DC motors have two main types: coreless and iron core. Using an iron core rotor is common for brushed motors above 10mm in diameter. The coils are winded on a laminated iron core, that gives them rigid support and helps to dissipate heat.

• Please be aware of using the adhesive while mounting motor, the residue may cause bearing damaged and motor run abnormally.
• Please check the loading is followed the motor specification, and do not hitch anything that may hinder the motor running on the output shaft.
• The external force on the shaft will affect the motor lifetime. Ex: external vibration or eccentric pinion.
• Do not keep motor in high temp and humidity condition, and please avoid motor to contact with corrosive gases. Improper preservation may cause motor failed in any form.
• Please avoid motor running in high temp and humidity condition. Otherwise, lifetime will be reduced greatly.
• While conducting the soldering process on terminals, the temperature of soldering iron must be 340 °C ±40 °C. Heating time is no more than 3 seconds. Process should avoid soldering tin getting into motor or wire end being broken.
• Please avoid the enduring stall situation while motor running. Otherwise, motors are easily overheated and burned out.
• Please provide a stable input voltage to ensure motor can run in provided specification.
• Do not mounting the motor with too long screws, it may cause motor to run abnormally.
• If the motor are destroyed by external force or applied in the improper situation, the quality and lifetime can’t be guarantee.

The Performance Chart of Brushed DC Motor:

• N is rotation speed. It indicates the number of revolution per minute (rpm) of the rotor. Speed would be varied if either voltage (V) supplied or load applied to the motor is varying.
• I is current. It indicates the amount of electrons (current) which is discharged when voltage is applied between the terminals of the motor. The load applied to the motor is directly proportional to the current drawn by the motor.
• T is torque. This is the twisting force that causing rotation of the rotor. The value of torque is depended on the load applied to and the current drawn by the motor.
• P is Out power. This is the work done by the motor which is the product of N and t The maximum output (Pmax) would be occurred at a point of Ts/2 on the P curve.
• E is efficiency. This is the percentage of the work done by the motor to the energy supplied to the motor. That is, the ratio of the mechanical output to the electrical input(E=P/VI x 100%).The maximum efficiency (Emax) would be found at a point in the torque range less than TS/2.